Sommario dellla classe

Costanti predefinite

CairoFormat::ARGB32

Each pixel is a 32-bit quantity, with alpha in the upper 8 bits, then red, then green, then blue.
The 32-bit quantities are stored native-endian.
Pre-multiplied alpha is used. (That is, 50% transparent red is 0x80800000, not 0x80ff0000.)

CairoFormat::RGB24

Each pixel is a 32-bit quantity, with the upper 8 bits unused.
Red, Green, and Blue are stored in the remaining 24 bits in that order.

CairoFormat::A8

Each pixel is a 8-bit quantity holding an alpha value.

CairoFormat::A1

Each pixel is a 1-bit quantity holding an alpha value.
Pixels are packed together into 32-bit quantities.
The ordering of the bits matches the endianess of the platform.
On a big-endian machine, the first pixel is in the uppermost bit,
on a little-endian machine the first pixel is in the least-significant bit.